Thyllanor could refer to three things:
or Thyllanor, as it exists today; the Realm of Thyllanor/Titular Kingdom of Thyllanor, as Dalan II Karthmere attempts to reinstate the kingdom following the Civil War and the dissolution of the Kingdom of Andoras.
Thyllanorian Interregnum, the period of time between 330 and 332 AC when there was no official ruler of Thyllanor
Thyllanorian, the native language of Thyllanor
Thyllanorian military, the armed forces of Thyllanor
Thyllanorian government, the structure of Thyllanor's government and the branches that it includes